I read an article in today’s Sacramento Bee about the Sherri Papini kidnapping case out of Shasta County. (http://www.sacbee.com/news/local/crime/article141599034.html) According to the Bee’s article, Papini’s husband Keith was cleared as a suspect when he passed a lie detector test.
A year and a half or so earlier, Isiah Fowler also passed a lie detector test, arranged for by his defense team of Mark Reichel and Steve Plesser. I was their investigator. The test was administered by an individual who actually trains the F. B. I. Calaveras County chose not to accept the results and instead relied on analysis techniques that were deemed inaccurate more than 10 years ago.
It appears that law enforcement gets to utilize polygraph tests only when convenient for them to do so.